Nonparametric Binary Recursive Partitioning for Deterioration Prediction of Infrastructure Elements

Table 1

FHWA’s concrete bridge deck condition rating system.

Condition Rating	Condition Indicators (% Deck Area)
	Spall	Delamination	Electrical Potentials	Chloride Content #/CY
9	None	None	0	0
8	None	None	None > 0.35	None > 1.0
7	None	< 2%	45% < 0.35	None > 2.0
6	< 2% spall or sum of all deteriorated or contaminated deck concrete < 20%
5	< 5% spall or sum of all deteriorated or contaminated deck concrete 20 to 40%
4	> 5% spall or sum of all deteriorated or contaminated deck concrete 40 to 60%
3	> 5% spall or sum of all deteriorated or contaminated deck concrete > 60%
2	Deck structural capacity grossly inadequate
1	Deck repairable by replacement only